Paint-spraying apparatus



April 14, 1931. A. F. JENKINS PAINT SPRAYING APPARATUS Filed Jan. 2, 1929 Patented Apr. 14, 1931 UNETE STATES ALEXANDER FREDERICK JENKINS, or BALTIMOREMARYLAND I PAINT-SPRAYING- APPARATUS Application 'filed January 2,1929. Serial No. 329,774.

The present invention relates to paint spraying devices and m ore particularly to devices of this type by means of which paint or the like may be sprayed by means of compressed air, such for instance as is disclosed in my co-pending application Serial No. 159,849, filed January 8, 1927. The object of the present invention is to provide an improved mechanism whereby the paint spray valve employed with devices of'this nature may be operated with greater facility and freedom from error. The invention may havevvarious forms and in the accompanying drawings one embodiment thereof is illustrated by Way of example. It will be appreciated, however, that minor changes may be made in the design and arrangement of the component elements of the invention without departing from its spirit and scope.

In the drawings Figure 1 is a side elevation of a paint spray device embodying the improvements constituting the present invention;

Figure 2 is a section on line 22 of Figure 1; and

Figure 3 is a perspective View of one of the details.

Since the details of the-interior passages and operating parts of the spray gun form no part of the present invention, they arejnot illustrated, and it will be sufficient for present purposes to explain that the paint spray device illustrated comprises essentially a body portion 10, a handle or grip portion 11' and a nozzle portion 12 mounted on the forward end of the body portion. Air flows to the discharge nozzle from a source of supply of compressed air which is connected to a coupling 13 which will be seen at the foot of the grip or handle 11, and makes its way to the nozzle through passages which are not illustrated, the flow of air being controlled by a valve positioned in a valve casing 14, which valve maybe operated from Without by longitudinally reciprocating the valve stem '15. .The paint or other liquid to be discharged from the nozzle is drawn or forced upwardly through a. conduit within the coupling member 16 and the flow of this liquid to the discharge nozzle is controlled by a valve, not shown, whichvalve isof the needle type and is. operable by the 1ongitudinally.reciprocable valve stem 17. Move ment of valve stems .15 and 17 toward the right (Figure 1) results in opening of both the air and liquid valves and movement toward the left in the closing thereof.

A trigger or operating lever is indicated at 18, this trigger being preferably stamped of sheetmetal and bifurcated at its upper end to receive the body 10, the eXtremeupper ends of the arms of the lever beingpivoted at 19 toan upward extensionof the body. 'A yoke'shaped member 20, more clear ly illustrated in Figure 3, is pivoted at 21 to the arms of operating lever 18, thislast mentioned member having forwardly-em' tending side portions and a'transverse portion 20 formed with a notch 2O .to receive the liquid valve stem 17. Member 20 has also a rearwardly extending portion 2O comprising a finger piece and by means of which it may be rocked from thefullline position, Figure 1, to the dotted line position.

Immediately in rear of the transverse portion 20 of member 20 is an abutment member 22, either fixed on stem 17, or adjustably secured on said stem. a g

It will be apparent that movement ofthe lower end of operating lever 18 toward the right (Figure 1) 'when member 20 is in its full line position, will result in simultaneous movement of stems 15 and 17 toward the right and in simultaneous Openingof the air and paint valves. p I

At times it is desirable to operate the air valve alone to effect the discharge of air front the nozzle, without simultaneouslydischarging paint. This result may be brought about "by locking the yoke 20 to its dotted line position, in which position it wholly-disengages the stem 17 and abutment 22 so that its movement to the right results in no :HIOVQ- ment of the paint valve operating stem 17. V

In thenormal operation of the paint spray device however it is necessary that the. yoke member 20 remain in its full line position so that bothvalve stems 15 and 17 will be rop erated upon a movementoflever For that reason I have provided member 20 with a portion 20 which constitutes a latch, cooperating With stem 17 in looking this member in the position in which it is shown in Figure 1. As can be seen from Figure 2 the latch 20 will prevent accidental raising of the yoke 20 since it projects somewhat beneath stem 17. To effect disengagement of members 17 and 20 it is necessary to exert a considerable pressure on the finger piece 20 to bring the 10 latch 20 above this stem, the lever 18 and member 20 being constructed of sheet metal or other resilient material possessing sufficient springiness to permit the slight necessary lateral movement of latch 20 in moving from one side of the stem 17 to the other.

The yoke 20 is therefore normally locked in its lowermost position, effecting an operative connection between lever 18 and stem 17 except when the operator definitely desires a 5 0 disconnection and effects the same by a sub stantial pressure upon the finger piece 20 Accidental disengagement, such as has been experienced by those operating devices of this nature, is wholly avoided.

'25 Having thus described the invention, what a is claimed as new and desired to be secured by Letters Patent is' 1. A paint spraying apparatus comprising a body, a discharge nozzle mounted thereon,

i a handle, air and paint valve operating stems,

a lever for operating both of said stems and a separable'connection between said lever and the paint valve operating stem which connection includes a member pivotally secured to the operatinglever a portion of which consntutesaiatch adapted to cooperate with thepaint valve stem, the lever and member being of resilient material whereby said portion is permitted to" spring laterally in passing the said stem and to spring to original position thereafter.

l 2. A paint spraying apparatus comprising a body, a discharge nozzle mounted thereon, a handle, air and paint valve operating stems, a

' lever for operating both of said stems and a separable connection between said lever and the paint valve operating stem which connection includes a yoke shaped member having its parallel sides pivotally secured to said 50 lever and a portion extending transversely of the paint valve stem, said last mentioned portion having a notch to receive said stem, one edge of said notch having a projecting. portion constituting a latch adapted to Cooper- 55 ate with said stem in holding said yoke in its stem engaging position, the lever and ydke b'eingof resilientmaterial whereby said portion is permitted to spring laterally in passing said stern and to spring to original posi- 69 tionthereafter.

In testimony whereof I hereunto afix my signature.

ALEXANDER F. JENKINS. 

